Abstract
We propose and experimentally demonstrate a microwave photonic filter
based on an electro-optic phase modulator (EOPM) and a Fabry–Pérot
semiconductor optical amplifier (FP-SOA). A microwave photonic filter with
a single passband between 0 and 40 GHz is obtained. In the single passband
microwave photonic filter, the microwave subtraction effect is introduced
in optical domain to improve the performance. A theoretical model is established
to describe the operation principle of the microwave photonic filter, and
the predicted results show good agreement with the experimental results. In
the experiment, the center frequency and the 3-dB bandwidth are 18.3 GHz and
99.5 MHz, respectively, with the corresponding Q factor of 184, and the rejection
ratio and shape factor are 34.3 dB and 5, respectively. The continuous wideband
tunability of the microwave photonic filter is also demonstrated by adjusting
the bias current of FP-SOA.
© 2011 IEEE
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